Feed-arm mechanism for sewing-machines.



e. HO EPNER. I FEED ARM MECHANISM FOR SEWING MACHINES.

APFLICATION FILED AUG-l5. 1911- w Eaten Apr. 23, mm...

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FEED-ARM MECHANISM F03, SEWING-MACHINES.

Specification of Letters Patent.

Patented a t. as, rare,

Application filed August 15, 1917. Serial No. 186,255.

To all whom it may concern:

Be it known that I, Gnonen Honrnnn, a

citizen of the United States, residing at Chicago, county of Cook, Stateof Illinois, have invented a certain new and useful Tmprovement inFeed-Arm Mechanism for SewingdVIachines, and declare the following to bea full, clear, and exact description of the same, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

The object of the present invention is to produce a simple, efficientand powerful work-feeding means for sewing machines, particularlymachines adapted to sew bags and other heavy work.

The various features of novelty whereby my invention is characterizedwill hereinafter he pointed out with particularity in the claims; but,for a full understanding of my invention and of its object andadvantages, reference may be had to the following detailed descriptiontaken in connection with the accompanying drawing, wherein:

Figure 1 is a side elevation of a fragment of a sewing machineillustrating the workfeeding arm and the means for actuating the latter;

Fig. 2 is a side view on a somewhat larger scale than Fig. 1 of thework-feeding arm including its actuating block, looking toward the;right from the left hand side of Fig. 3 is an elevation on an enlargedscale of the actuating blocklooking at the side opposite to that whichappears in Fig. 2; and

Fig. 4; is a section taken on line 4-4 of Fig. 3.

Referring to the drawing, 1 represents an arm pivotally supportedbetween its ends so as to permit it to oscillate about two axes at rightangles to each other; In the arrangement shown, the arm is in the formof an open frame within which is arranged a block, 2, hung upon a pin,3'. The 'block 2 is secured to some stationary part, 4, of the sewingmachine frame by means of a pin, 5, extending at right angles to theaxis of the pin 8 through the block. The pins 3 and 5 are fitted in theblock so that there may be relative rotary movement, without lostmotion, between each of the pins and the block. On one end of the arm isa Workengaging and feeding foot, 6, while adjacent to the other end ofthe arm is a driving shaft, 7, which extends parallel to the pin 5 andat right angles to the pin 3. The driving shaft preferably extendsthrough the adjacent end of the work-feeding arm which takes the form ofa wide fork, 8. In the fork 8 is slidably fitted a block, 9, adapted tomove lengthwise of the arm and also transversely of the arm in a planeat right angles to the driving shaft. The block has a round opening, 10,extending through the same and in this opening lies an eccentric, 11,which is fixed to the driving shaft. In the outer end of the block is aslot, 12, in a plane inclined to the axis of the driving shaft andparallel to the axis of the pin 3. Between the outer ends of the arms ofthe fork 8 extends a cross piece, .13, on which is arranged a roller,14, lying in the slot 12 and hlaving a diameter equal to the width ofthe s 0t.

The block is so supported in the machine that it is free to move in anydirection in a plane at right angles to the driving shaft but is heldagainst movement in the direction of the length of the driving shaft.This may he accomplished by holding the block-in suitable stationaryguides, 15, or by means of suitable collars or shoulders on the drivingshaft, or both. In the arrangeinent shown, the eccentric is provided atone end with a collar-like part, 16, through which passes a set screw,17, adapted to hold the eccentric in place, "While this arrangement'isintended to permit ready adjustment of the eccentric to be made it willbe seen that the part 16, if desired, could be made to serve as anabutment to hold the block against movement axially of the shaft.However, since the thrust on the block in the direction of the length ofthe" shaft is considerable, I prefer to have it resisted by stationaryrigid guides.

It will be seen that as the driving shaft revolves the eccentric movesthe block through an endless path, such component which is transverse tothe longitudinal axis of the arm'serving to produce a swinging movementof the arm around the pin 5, while such component which is in thedirection of the length of the arm produces a wedging action on theroller 14: which re sults in a swinging movement of the arm around thepin 3. By giving the-proper throw to the eccentric and the proper anglefrom the workand carried back out of en- 7 'gagement with the work andfinally be brought to the starting point to'take hold of the Work forthe next feeding movement.

-While I have illustrated and described with particularity only a singlepreferred form of my invention, I do not desire to be limited to'theexact structural details thus illustrated and described; but intend tocover all forms and arrangement which come within the terms employed inthe definitions of my invention constituting the appended claims.

I claim:

1. In combination, an arm pivotally supported so as to be capable ofswinging about two axes at right angles to each other, a block slidableinone end of said arm, said block having a slot therein in a planeparallel with one of said axes and at an acute angle with the other ofsaid axes, an eccentrio arranged in said block with its axis par- Copiesof this patent may be obtained for allel to the last mentioned axis, apart on said arm extending into said slot, and means for turning saideccentric. o

2. In combination, an arm pivotally supported so as to be capable ofswinging about two axes at right angles to each other, a block slidablein one end of said arm, said block having a slot therein in a planelying parallel with one of said axes'and forming an acute angle with theother of said axes, an eccentric arranged in said block with its axisparallel with the last mentioned axis, a

part on said arm extending into said slot, stationary guides cooperatingwith the block to limit it to movements in a plane at right angles tothe axis of said eccentric, and means for actuating said eccentric.

3. In combination, an arm pivotally supported so as to be capable ofswinging about two axes at right angles to each other, a block mountedin one end of said arm so as to be movable freely in a plane containingthe longitudinal axis of the arm and one of the aforesaid axes and beheld against movements transversely to said plane, an eccentric in saidblock having its axis parallel with the last mentioned axis, said blockhaving a slot lying in a plane arranged at right angles to the aforesaidplane and forming an acute angle with the axis of the eccentric, aroller carried by said arm and projecting into said slot, and means foractuating the eccentric.

4. In combination, an arm pivotally supported so as to be capable ofswinging about two axes at right angles to each other, one end of saidarm being in the form of a fork having parallel inner faces, a blockfitting slidably between and movable freely in all directions acrosssaid faces, an eccentric arranged in said block with its axis lyingparallel to said faces and parallel with one of the aforesaid axes, saidblock having a cam face arranged in a plane extending at right angles tosaid faces and making an acute angle with the axis of the eccentric, apart on said arm engaging with said cam face, and means for actuatingsaid eccentric.

In testimony whereof, I sign this specification.

GEORGE HOEPNER.

five cents each, by addressing the Commissioner of Patents, 'Washington,D. G.

